Traction device



CII

Patented `May 5, 1925'.

RAYMON A. SHIMAY, OF BOSTON, MASSACHUSETTS.

TRACTION DEVICE.

Application led February 9, 1924, Serial No. 691,571.

T0711/ 'whom t may concern.' i

Be it known that l, lil-,renin Sinner, a citizen of the United `tates, and a resident oil Boston, in the coun@7 ot dudolk and Connnonwealth ot Massachusetts, have invented certain new and useful Improvements in Traction Devices, ot which the following; is a full, clear, `and exact 'specilisation.

The object of struction of improved devices adapted to `be attached to the telly andv tire of an automobile or truck for the purpose oiiincreasinn` the tractive effect ot the drivers.`

ln the drawings, Fig. l is a cross section ot a portionot 'a 'pneumatic tire and rim showing' one form ot the invention applied thereto.` Figa is a plan view ot `another p form ot' the device looking` at its outer sur` tace. Fing. S is a perspective y'iew ot one ot the `two members ot a Amodiiication thereof. Fin'. 4 is a side sectional view oi? the device. Fig. 5 is an end view ot'a form of the same designed for trucks having` solid rubber tires. Fig.6 is aplan view or the same, parts being removed and broken away. Fig. 7 is a face view of one oi" the links employed in the device. Fig'. 8 is a side sectional view of an end of the device shown in Fig. 5. Fig. 9 is a view of the tread .face ot an end of the device. Fig. l0 is a perspective view of a calli-extension. Fig'. llis a perspective view of my preterred form of calla-extension.

l prefer to make each device in two sections hinged together in order to lit tires ot different diameters. As these sections are substantially duplicates ot each other, I will describeone ot them, and will begin with the structureillustrated in Figs. l, 3 and 4l. lFach consists of a plate l `concaved on the tace designed to Contact with the tire, and having calksQ on the outer or conveX tace. The calk shown inFin's. 3 and 4 is located at the midlength ol' the plate l. and is strengthened bv braces 3, while that shown in Fie, l and designated as Q is centrally recessed, as at 4 to increase its ease oi penetration in ice and hard `ground but has no brace To aid the oalks in deep snow or mud, I provide an extension therefor, as illustrated at 5 in Figs. et and 10. The extension 5 is notched at G to lit upon the calk 2, and at 7 to avoid the braces 3, and removabl)7 held in place by bolts S, as in Fig. Ll.

At cach side of the plate l are two ears 9 between which are pivoted the outer ends ot the locking nlcinbersl() and ll. The locking member l0 is provided with l'an elbow l2 at its treeend designed to i. lie parallel with the axis of the wheel on which the traction device is mounted.` `The locking member 1l is considerably longer and curves over the fellv 13 of the wheel and has its extremit7 disposed to `lie parallel with the elbow l2. Through this elbow and extremity-'lil is passed a bolt 15 lntvine a nut 1G thereon, which, when snugly tinhteneiil, serves to [irmly clamp between the portion 17 ot the member ll andthe plate l the tellv 13 `and the tire 19.. i

At one end of each plate, l are a pair ot ears 2l penetrated by a bolt or rivet 22 and which hinge the two plates toast-her, as shown in Figs. 2 and 4. Thus hinged, the plates not onl7 `tit tires ot differentdiameters but permit ot the liexine required as each sect-ion l, is temporarily pressed up into the partly yielding tire.

`In the structure illustrated in Figs., 5 and 6, the plates Q5 are each'provided with three ears 26 at each side to which are pivot ed links 27 by means ot bolts or rivets 29, eac-h end of a link 27 having' two ears Between the two ears of the tree ends ol" link 27 is pivoted a locking member 3l having an elbow 32 substantially parallel with the axis of `the wheel to which the device is to beattached. The locking member is pivoted between the ears 30 ot the other link 27 and is made with a bend at to present its section 35 pa 'allel with the el- A bolt`36 passing` through the elbow 32 and one of the bolt holes 37 with which the sec-tion 35 is provided, enables the locking,` members to kbe drawn iirmly toward each other and thereby to clamp the traction device in place. I prefer. however, to use two`bolts 36 in` order to render the fastening `more secure. Bv means ot the links 27 and the lengthened portion 35 with its several holes 37 (Fig. 6), the device can be applied to the heavyv driving wheels o'l a truck provided either with a single solid tire or duo-tires.

I preter to provide these plates with calks 39, each calk being located near the outer end ol each section 25, as shown in Figi'. 2, and made V-shaped as shown in Fig'. 9 m order the better' to hold its grip in the roadway. Fig; 8 illustraties a n mreentrant calli 2 located at the end of a section It is preferable to appl)7 at least two of these traction devices on each drive wheel ot the car in order that they may be disposed to rounterbalance each other.

In applying one of these traction devices to a wheel it is desirable to have the elbow l2 or 32 and the extension let or 85 come at the outside of the wheel in order to render it very much easier to introduce and tighten up the bolts l5, or 36.

Wvhere the calks 39 are made ti-shaped, with their re-entrant surfaces in advance, as shown in Figs. 6 and 9, the traction device as illustrated in Figi". G would be adapt ed for the right-hand drive wheel only, 'to present the terminal portion 3.3 outwardly.

To lit the calks B9, the calleextensions l0 are made similarly V-shaped, as shown in Fig. ll.

Not only does the reentrant tace oll the calks 39 get a better grip upon the earth. but the V-shape thereof Serves the additional purpose of bracing the calks against the tractive-strains.

What I claim as my invention is:

l. A traction device comprising.;` a plate having,` a calk on its exposed tace, and loci;- ing members loosely connected with said plate, one locking,` member having an elbow substantially parallel with the axis of the wheel, and the other lockingl member passing over the rim ot' the wheel and having its terminal portion substantially parallel with said elbow, and a bolt penetrating said terminal portion and elbow and forcing them toward each other,

2. A traction device comprising a plate having a calk projecting from its exposed lace and ears at each side thereof, links pivoted to said ears, a locking member having an elbow designed to be disposed parallel with the axis of the wheel for which the device is designed, the other end oil said member beingl pivoted to one ot said links, a second locking member pivoted at one end to the other of said links and having its other end disposed near to and parallel with said elbow, and a bolt joining said end and elbow.

3. il traction device comprising' a plate havingv a calli projecting from its exposed face and three ears at each side thereof, a link havingl two ears at each end thereof pivoted to each set of ears, a locking' meinber having one end pivoted betwem the two ears otone ot said links, and having4 an elbow at its other end parallel with the axis of the wheel Jor which 'the device is de signed, a locking device pivoted at one end between the ears of the other link and having` its iiree end elongated and provided with a plurality of bolt holes, said end portion being disposed to lie substantially parallel with said elbow, and a bolt passing` through said elbow and one of said holes for joining; the parts.

ln testimon)Y that l claim the foregoi11;;` invention, l have hereunto set nl v hand this 7th day of February, 1924.

RAYMON A. Sl-HMA l'. 

